Title:
セラミック担体およびセラミック触媒体
Document Type and Number:
Japanese Patent JP4548968
Kind Code:
B2
Abstract:
A ceramic carrier and ceramic catalyst body used as NOx purification catalysts for lean burn engines, which are inexpensive, exhibit high temperature durability and can maintain their catalytic function for extended periods. The ceramic carrier has a diffusion-inhibiting layer formed on the surface of a cordierite honeycomb structure, to inhibit diffusion of alkali metals, alkaline earth metals, etc. carried as NOx storage materials. The diffusion-inhibiting layer is composed of a ceramic material such as Y2O3, NiO or CeO2 which does not react with alkali metals or alkaline earth metals at temperatures of up to 1000° C. and has a melting point of higher than 1000° C., and the diffusion-inhibiting layer inhibits diffusion of catalyst components such as potassium into the interior to prevent their reaction with cordierite, so that the durability is greatly enhanced without reducing catalytic performance.
Inventors:
Masanori Yamada
Tomohiko Nakanishi
Yoshiyasu Ando
Tomohiko Nakanishi
Yoshiyasu Ando
Application Number:
JP2001122055A
Publication Date:
September 22, 2010
Filing Date:
April 20, 2001
Export Citation:
Assignee:
株式会社日本自動車部品総合研究所
株式会社デンソー
株式会社デンソー
International Classes:
B01D53/86; B01J33/00; B01D53/94; F01N3/10; B01J21/16; B01J23/02; B01J27/24; B01J32/00; B01J35/00; B01J35/04; B01J37/02; F01N3/28
Domestic Patent References:
| JP7096183A | ||||
| JP9141106A | ||||
| JP3207446A | ||||
| JP10165817A | ||||
| JP10137590A | ||||
| JP6031139A |
Attorney, Agent or Firm:
Motomu Itou